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Sivakumar, M V K and Shaw, R H (1978) Relative evaluation of water stress indicators for soybeans. Agronomy Journal, 70 (4). pp. 619-623. ISSN 0002-1962
ICRISAT, - (1978) Proceedings of the Internat ional Workshop on the Agrocl imatological Research Needs of the Semi-Arid Tropics. International Crops Research Institute for the Semi-Arid Tropics.